The invention relates to a gas, water and coal separation device of a coal-mine gas spray hole. The gas, water and coal separation device comprises a borehole casing, four ways, a gas pre-extraction pipe, a drill pipe, a drilling machine, a drilling machine support, a seat stand, a coal guide pipe, a coal bunker, a bunker A coal unloading pressure switch, a bunker A movable coal unloading plate, a bunker dividing plate, a bunker A gas extraction and drainage pipe opening valve, a bunker A gas extraction and drainage pipe, a bunker A filter screen, a bunker A coal guide pipe valve, a bunker A coal guide branching pipe, a bunker B coal guide branching pipe, a bunker B coal guide pipe valve, a bunker B filter screen, a bunker B gas extraction and drainage pipe, a bunker B gas extraction and drainage pipe opening valve, a bunker B movable coal unloading plate, a bunker B coal unloading pressure switch, a coal baffle, a bunker A and a bunker B, wherein the bunker is a main separation device consisting of two separation bunkers of which the structures are the same; and the short-time storage and separation of the gas, water and coal can be alternately finished by the two separation bunkers. With adoption of the gas, water and coal separation device, through a manner of the double bunkers, the efficiency and stability in discharging and spraying matters can be greatly improved and the gas, coal and water can be uninterruptedly separated.